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1
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
For the following Assertion and Reason, the correct option is
Assertion : For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason : The reactants are most strongly adsorbed on group 7-9 elements.
A
Both assertion and reason are true and the reason is the correct explanation for the assertion.
B
The assertion is true, but the reason is false.
C
Both assertion and reason are true but the reason is not the correct explanation for the assertion.
D
Both assertion and reason are false.
2
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :
A
AICl3 > K3[Fe(CN)6] > K2CrO4 > KBr = KNO3
B
K3[Fe(CN)6] < K2CrO4 < KBr = KNO3 = AlCl3
C
K3[Fe(CN)6] < K2CrO4 < AlCl3 < KBr < KNO3
D
K3[Fe(CN)6] > AlCl3 > K2CrO4 > KBr > KNO3
3
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Among the following, the INCORRECT statement about colloids is :
A
The range of diameters of colloidal particles is between 1 and to 1000 nm
B
they are larger than small molecules and have high molar mass
C
They can scatter light
D
The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.
4
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Peptization is a :
A
process of converting soluble particles to form colloidal solution
B
process of converting precipitate into colloidal solution
C
process of bringing colloidal molecule into solution
D
process of converting a colloidal solution into precipitate
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